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TMDSCNCD28388D: ADC of Dsp Unipolar or Bipolar?

Gianluca Di Pietro
Prodigy 40 points

Part Number: TMDSCNCD28388D

Tool/software:

Hello everyone, i am using the DSP TMDSCNCD28388D and i am actually asking if the ADC modules embedded are unipolar or bipolar? I need to read positive and negative currents so i need a bipolar one but reading the DataSheets i found a range of voltage between VSS ( 0 V) and VDDA around 3V + 0.3. So i want to ask you if there's something i missed cause it looks like the ADC modules are unipolar. In the case the ADC are unipolar how it will be possible to read negative currents also? is there something i have to do? can you please give me all the possible advices in order to solve. Thanks in advice.

Best regards

  • 0
    TI__Expert 8730 points

    Hello,

    ADC modules are unipolar and their input range is from 0V (VSS) to VDDA, which is typically 3.3V. This means they cannot directly measure negative voltages, such as those resulting from bidirectional current sensors without additional circuitry. You need to bias the signal so that it stays within the 0–3.3V ADC input range. To read bipolar currents, you must shift the current sensor output to a mid-supply reference, typically 1.65V.

    Best Regards,

    Masoud